Same agency has to do with plants. I could not see anything on bonsai trees but here is their question form: http://www.inspection.gc.ca/english/tools/feedback/commene.shtml so you can ask.
Ask Canadian Cutoms & Border Controll authorities. I am sur they will have answer to your question. All pets coming into another country need vaccination and health clearance appart from clearance from cutoms and immigration authorities.
